Valve



Patented May 22, 1923.

STATES EDWARD S. MCGEE, OF ROCK HILL, SOUTH CAROLINA.

VALVE.

Application filed December 2, 1921. Serial No. 519,551.

To all whom it may concern:

Be it known that I, EDWARD S. MoGnE, a in citizen of the United States, and resident of Rock Hill, county of York, and State of South Carolina, have invented certain new and useful Improvements in Valves, of which the following is a specification.

My present invention relates to valves and more particularly to the class of valves used with horizontal or vertical steam boilers as gauge cocks, which are utilizable to indicate the head of water or steam contained in the said boiler.

More particularly my invention has to do with particular details of construction of the above type of cocks which will prevent an accidental blowing out of the same, due to breakage in thevalve shaft anywhere of its entire length, or breakage in the valve head which retains the pressure within the boiler.

Another object of my invention is to provide means to prevent escaping steam or water upon actuation of the gauge cock from reaching the hand or body of the operator.

Still another object is to devise a cock which may be repacked if necessary while the boiler is under full head.

Still another object is to secure a valve head and seat which will not be fouled by usual boiler scale and which further may be reground while the valve is in place and while the full head of steam is contained within the boiler.

These and other objects I secure by providing a valve body having a reciprocablc valve stem therein, a head on said stem seating upon a face in the body, said valve head opening against steam pressure, and a second valve head spaced from the first mentioned head on the same shaft which is held from seating against a corresponding face in the valve body by the first mentioned valve head. In such a construction in case valve head No. 1 gives way, valve head No. 2 under the actuation of the head pressure would instantly seat, thereby preventing a blowout with its accompanying danger.

My invention further consists in the novel arrangement, construction and combination of parts more fullv hereinafter described and with reference to the accompanying drawings, in which Figure 1 is a longitudinal sectional view through the device.

Figure 2 is a side elevation of the valve open position.

Referring now more particularly to these drawings, the numeral 1 represents a valve body of suitable construction, having a threaded end 2 insertable within the boiler wall, having an aperture 8 therethrough adapted to receive valve stem 4. The usual packing 5 is provided at one end of the body 1 which in combination with packing retaining member 6 and the cap member 7 effectively prevents steam or Water from escaping along the valve stem when the valve head is unseated.

The stem 4 is shown to have an enlarged valve head 8 which is seatable upon face or valve seat 9 on the end of the body with the pressure of the steam. Within the body is a second valve seat 10, and spaced apart therefrom is a second valve head 11 which is, as in the case of the first valve head,

carried by the stem 4.

The cap member 7 is provided with lugs 12 each having an aperture 13 therein. Either lug is adapted to receive the link member 14 pivoted to actuating lever 15, as by means of a taper pin 16 passing through the aperture 13 in the lug and aperture 17 in the link member. A spiral spring 3 surrounds the backwardly extending portion of the valve stem 4, which extremity is constructed to receive an ordinary rotatable wheel 3.

The body 1 is suitably recessed around the valve stem and is provided with an opening 18 which is screw threaded to receive a drain pipe 19 or the like, which may be used to conduct away the steam or water to a point visible, yet out of contact with the operator. 1

The operation of the device is as follows: The gauge cock as a whole is insertable in the usual holes provided for this purpose in the boiler, and it will be apparent that the pressure within the boiler will retain the valve head 8 upon its seat in the end of the body 1. If now it is desired to ascertain the height of water in the boiler a slight movement of the actuating handle will bear upon the valve stem 4, moving this stem against the pressure of steam in the boiler, and the steam or water, as the case may be, will escape through the aperture in the valve body provided for this purpose. If for any reason the valve head 8 should break or be broken ofl of the stem 4, the pressure acting upon the second valve head would instantly cause this member to seat upon its respective face, which would result only in a momentary escape of steam or water through the aperture in the body, and no damage would result. If the valve stem should break in any place between its extremities, the fact that the valve head 8 seats against its face or seat with the pres sure of the steam will effectually prevent a blow-out.

These safety features are of a great advantage in this art where such accidents as above occasionally occur with disastrous results.

If the old packing around the valve stem is found to be worn, the cap is merely removed, the packing retaining means pulled back, and new packing inserted, without removing the gauge cock from the boiler, or without diminishing the head of steam.

The spiral spring encircling the outwardly extending portion of the valve stem serves the purpose of preventing leakage of water from the boiler'while the same is dead, or not in use.

In case scale or other foreign material is located between the valve and its seat, such a condition allowing steam or water to escape through the aperture in the body, by merely rotatingthe hand wheel and likewise the valve stem 4., the head 8 is reground upon its seat, the scale acting as an abrasive, thus quickly insuring a reseating of the valve and preventing further loss of stean'i or water.

It will be thus apparent that I have provided a guage cock which has positive means for preventing a blow-out in case the active valve becomes accidentally broken, that in case the valve stem is twisted off or broken such Will not be blown out and thereby cause injury to persons standing near, that the escaping steam or water when the valve 8 is unseated cannot come in contact with the body of the operator, that the cock may be readily repacked without diminishing the head of steam, that the active valve head may be readily reground in the event of ineffectual seating, and that by so doing I'have provided a valve of extremely simple construction, which may be manufactured at small cost, which has few moving parts, and which will not readily get out of order.

lVhile I have shown this type of valve as satisfactorily utilize-ole in a steam boiler, I do not wish to be limited thereto, as 0bviously it may be used in any connection where a valve is used to retain fluid under pressure within a container.

1 have illustrated certain details of construction which have been found satisfactory under certain conditions, but obviously various modifications of this construction will occur to those skilled in this art under dissimilar conditions and this invention is therefore not limited to the form illustrated.

I claim:

1. A valve including a body having an aperture therein, an outlet for said aperture, a valve stem reciprocable in said aperture, a valve head on said stem cooperating with a valve seat on said body upon movement of said stem in one direction, and means adapt-- ed to close the aperture upon further movement of the stem in said direction.

'2. The device of claim 1, said means including a valve head and seat.

3. The device of claim 1, said means including a valve head and seat normally out of engagement.

4. The device of claim 1, said means including a valve head and seat, said first mentioned valve head upon seating preventing said second mentioned valve head from seating.

5. The device of claim 1, said means including a valve head and seat, said second mentioned valve head being carried by said valve stem.

6. A valve including a body having an outlet, a valve stem reciprocable therethrough, two valve surfaces carried by said stem, two valve seats in said body, the distance between the seats being greater than the distance between the valve surfaces, both valve seats and surfaces being on the same side of the valve outlet.

In testimony whereof, I afliX my signature.

E'DYVARD S. MOGEE.

Lil 

